The picturesque Blue Ridge Mountains run through western Virginia and form the easternmost and highest range of the main section of the Appalachians. The valley of Big Run is one of the Shenandoah National Park's most scenic. From Big Run Overlook (milepost 81.2), the vista opens into the depths of the park's largest stream, surrounded by Rockytop Ridge, Rocky Mountain and Brown Mountain. On a clear day the quartz outcrops on Rocky Mountain are visible.